Zenith701801-List Digest Archive

Fri 09/12/08


Total Messages Posted: 7



Today's Message Index:
----------------------
 
     1. 08:49 AM - 801 seat belts (Keystone Engineering LLC)
     2. 10:07 AM - Re: 801 seat belts (Terry Phillips)
     3. 10:24 AM - Re: Zenith701801-List Digest: 8 Msgs - 09/11/08 (Bob & Lin)
     4. 10:52 AM - Re: Re: Zenith701801-List Digest: 8 Msgs - 09/11/08 (BokKat)
     5. 12:25 PM - Re: 801 seat belts (n85ae)
     6. 07:19 PM - 701 corvair (Roy Szarafinski)
     7. 07:43 PM - 701 tunnel clearance (Tracy)
 
 
 


Message 1


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    Time: 08:49:12 AM PST US
    From: Keystone Engineering LLC <keystone@gci.net>
    Subject: 801 seat belts
    Jeff Can I get pics of how you beefed up your seat belt attach points? When Jim F wrecked his 801 the rivets pulled out from the center attach point. He was in the plane by himself when he crashed. I hate to think what would have happened if there had been 2 people in the front seat. I suspect ZAC assumed the rivets would be in shear but they failed in tension. I installed another AL plate under the tunnel top and used A-6 rivets on my center attach point after what happened to Jim. Bill Wilcox N801BW Valdez, AK 15 hrs on Full Lotus floats Time: 12:54:34 PM PST US Subject: Zenith701801-List: Re: Shoulder Harness attachment From: "n85ae" <n85ae@yahoo.com> Something to think about, because Zenith sure did not do their engineering calculation with regard to the seatbelts. I calculated the stock 801 seat belt tabs at 200lb.s at 10G's in shear, if indeed the rivets don't pull out before that. So I replaced them with 4130 steel the same thickness which I bolted with AN3's to the fueslage longerons. I also added structure to the center console. Crash impacts can go up to 40/50G's and be survivable, so I'm not sure what they were thinking when the designed the stock ones. But they were not designed to handle more than the bare minimum. I suppose if I crash that hard I might not survive anyway, but I sure don't want to leave on account the seat belt tabs sheared. Jeff


    Message 2


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    Time: 10:07:40 AM PST US
    From: Terry Phillips <ttp44@rkymtn.net>
    Subject: Re: 801 seat belts
    Bill I'm going to chip in here, even though I'm the 601 side. IMHO, this is a very important topic. I have a good friend who was a NM Army National Guard helicopter pilot for many years. He told me that, on several occasions, he participated in recovering the bodies of downed pilots who, in his opinion, would have survived their crash if they hadn't smashed their face into the panel. He's a big believer in robust seat belts/harnesses. In my 601XL, I'm planning on using the shoulder harness that Van's sells for their RV's (for a very reasonable price). Klaus Truemper installed similar 4-point belt-harnesses in his 601HDS. I asked him about the attachment and here are my notes from our conversation: "On each side he ran a reinforcement of ~0.060 6061-T6 from the longeron at the rear of the baggage compartment (I assume this was the normal attachment point for Zenith shoulder belts) to just aft of the seat backs. This sheet was placed beneath the baggage compartment floor. Then he attached the shoulder harness brackets with a bolt through the baggage compartment floor and the 0.060 reinforcement. The reinforcement was shaped like a Y going back to each longeron and was attached to longeron/fuselage/baggage floor joint with 5 or 6 solid rivets." I believe that the reinforcement was riveted to the baggage compartment floor also. Terry At 07:48 AM 9/12/2008 -0800, you wrote: >Jeff > >Can I get pics of how you beefed up your seat belt attach points? > >When Jim F wrecked his 801 the rivets pulled out from the center attach >point. He was in the plane by himself when he crashed. I hate to think >what would have happened if there had been 2 people in the front seat. > >I suspect ZAC assumed the rivets would be in shear but they failed in >tension. > >I installed another AL plate under the tunnel top and used A-6 rivets on my >center attach point after what happened to Jim. > > >Bill Wilcox >N801BW >Valdez, AK >15 hrs on Full Lotus floats > > >Time: 12:54:34 PM PST US >Subject: Zenith701801-List: Re: Shoulder Harness attachment >From: "n85ae" <n85ae@yahoo.com> > > >Something to think about, because Zenith sure did not do their engineering >calculation with regard to the seatbelts. > >I calculated the stock 801 seat belt tabs at 200lb.s at 10G's in shear, if >indeed the rivets don't pull out before that. So I replaced them with 4130 >steel the same thickness which I bolted with AN3's to the fueslage >longerons. I >also added structure to the center console. > >Crash impacts can go up to 40/50G's and be survivable, so I'm not sure >what they were thinking when the designed the stock ones. But they were >not designed to handle more than the bare minimum. > >I suppose if I crash that hard I might not survive anyway, but I sure don't >want to leave on account the seat belt tabs sheared. > >Jeff Terry Phillips ZBAGer ttp44~at~rkymtn.net Corvallis MT 601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail, flaps, & ailerons are done; working on the wings http://www.mykitlog.com/N47TP/


    Message 3


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    Time: 10:24:11 AM PST US
    From: "Bob & Lin" <tumates@gmail.com>
    Subject: Re: Zenith701801-List Digest: 8 Msgs - 09/11/08
    Another Slat issue... Since the slats become effective at high angles of attack, and even Zenair is using Feathers VGs on the elevator, has anyone thought of using VGs on the front of the slats to add control at shallower angle of attack while keeping the slats benefit for steeper approaches? Anyone care to try that for the best of both worlds? Bob Lee On Fri, Sep 12, 2008 at 2:58 AM, Zenith701801-List Digest Server < zenith701801-list@matronics.com> wrote: > * > > ================================================= > Online Versions of Today's List Digest Archive > ================================================= > > Today's complete Zenith701801-List Digest can also be found in either of > the > two Web Links listed below. The .html file includes the Digest formatted > in HTML for viewing with a web browser and features Hyperlinked Indexes > and Message Navigation. The .txt file includes the plain ASCII version > of the Zenith701801-List Digest and can be viewed with a generic text > editor > such as Notepad or with a web browser. > > HTML Version: > > > http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 08-09-11&Archive=Zenith701801 > > Text Version: > > > http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 08-09-11&Archive=Zenith701801 > > > =============================================== > EMail Version of Today's List Digest Archive > =============================================== > > > ---------------------------------------------------------- > Zenith701801-List Digest Archive > --- > Total Messages Posted Thu 09/11/08: 8 > ---------------------------------------------------------- > > > Today's Message Index: > ---------------------- > > 1. 05:22 AM - Re: Unequal fuel tank levels (Zed Smith) > 2. 06:40 AM - Re: Unequal fuel tank levels (n85ae) > 3. 08:16 AM - test (Dan) > 4. 08:27 AM - Re: test (Ken Arnold) > 5. 11:32 AM - CH701 POH (Ken Arnold) > 6. 12:54 PM - Re: Shoulder Harness attachment (n85ae) > 7. 02:46 PM - Re: CH701 POH (John Swanson) > 8. 05:19 PM - Re: Shoulder Harness attachment (Viper_on_line) > > > ________________________________ Message 1 > _____________________________________ > > > Time: 05:22:39 AM PST US > From: Zed Smith <zsmith3rd@earthlink.net> > Subject: Zenith701801-List: Re: Unequal fuel tank levels > > > do not archive > > Gravity-induced air leakage is the problem. > > One wing, being slightly lower than the other, upsets the intended equal > distribution > of fuel. > This then results in massive amounts of air getting into the higher tank. > A two-inch left-to-right tilt is nearly one-half the depth of the 701 > tanks; nearly > one-half the capacity. > > A wise old ag pilot once told me that the prop was just a big fan....it is > there > to keep the pilot cool. > He went on to say that if the fan stops you can see the pilot sweat. > > Those with unequal fuel levels may need to install an auxillary air pump to > replenish > the tank with less air. This may help to keep the fan running. > > Everybody have a nice day, and straighten up and fly right-hand patterns!! > > Zed > > > ________________________________ Message 2 > _____________________________________ > > > Time: 06:40:59 AM PST US > Subject: Zenith701801-List: Re: Unequal fuel tank levels > From: "n85ae" <n85ae@yahoo.com> > > > If you guys REALLY want to understand why the fuel level is different, > then you have to drop the simplistic view. > > Go to Google and search on "fluid dynamics hydraulic head", it's not > completely simple but this is the explanation as to why the difference. > > There are a great number of factors that are at play, the end result is > pressure differential across the tanks > > Regards, > Jeff > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p 3794#203794 > > > ________________________________ Message 3 > _____________________________________ > > > Time: 08:16:37 AM PST US > From: Dan <dwilde@clearwire.net> > Subject: Zenith701801-List: test > > > test > do not archive > > > ________________________________ Message 4 > _____________________________________ > > > Time: 08:27:23 AM PST US > From: "Ken Arnold" <arno7452@bellsouth.net> > Subject: Re: Zenith701801-List: test > > > good test Dan, > > do not archive > > > ----- Original Message ----- > From: "Dan" <dwilde@clearwire.net> > Sent: Thursday, September 11, 2008 11:13 AM > Subject: Zenith701801-List: test > > > > > > test > > do not archive > > > > > > > > > > > > > ________________________________ Message 5 > _____________________________________ > > > Time: 11:32:34 AM PST US > From: "Ken Arnold" <arno7452@bellsouth.net> > Subject: Zenith701801-List: CH701 POH > > Hi Listers, > I have a draft of the subject. Still needs some tweaks. Anyone wanting > to take a look is welcome. > > Please contact me directly via my e-mail address. > Regards, > Ken > > do not archive > > ________________________________ Message 6 > _____________________________________ > > > Time: 12:54:34 PM PST US > Subject: Zenith701801-List: Re: Shoulder Harness attachment > From: "n85ae" <n85ae@yahoo.com> > > > Something to think about, because Zenith sure did not do their engineering > calculation with regard to the seatbelts. > > I calculated the stock 801 seat belt tabs at 200lb.s at 10G's in shear, if > indeed the rivets don't pull out before that. So I replaced them with 4130 > steel the same thickness which I bolted with AN3's to the fueslage > longerons. I > also added structure to the center console. > > Crash impacts can go up to 40/50G's and be survivable, so I'm not sure > what they were thinking when the designed the stock ones. But they were > not designed to handle more than the bare minimum. > > I suppose if I crash that hard I might not survive anyway, but I sure don't > want to leave on account the seat belt tabs sheared. > > Jeff > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p 3870#203870 > > > ________________________________ Message 7 > _____________________________________ > > > Time: 02:46:12 PM PST US > From: "John Swanson" <jswanson@jamadots.com> > Subject: Re: Zenith701801-List: CH701 POH > > > ----- Original Message ----- > From: Ken Arnold > To: zenith-list@matronics.com > Sent: Thursday, September 11, 2008 2:30 PM > Subject: Zenith701801-List: CH701 POH > > > Hi Listers, > I have a draft of the subject. Still needs some tweaks. Anyone > wanting to take a look is welcome. > > Please contact me directly via my e-mail address. > Regards, > Ken > > do not archive > KenI would like to see ur Poh I hope > have my 701 flying this month.CH701 912 ULSJohn Swanson > > > ------------------------------------------------------------------------- > ----- > > > Checked by AVG - http://www.avg.com > 9/11/2008 7:03 AM > > ________________________________ Message 8 > _____________________________________ > > > Time: 05:19:57 PM PST US > Subject: Zenith701801-List: Re: Shoulder Harness attachment > From: "Viper_on_line" <randnc@bigpond.com> > > > Thanks Guys, > The load dissipation of the seat belt mount can become intricate when you > can't > get to a longeron as in the case of the shoulder harness. And then as has > been > said is the 0.063 going to be going to be strong enough to prevent the bolt > ripping out if you make the mounting structure too strong? I think it is > better > to have the seatbelt support structure crumple but keep you at least > partially > secure than have the belt bolt rip out. > > At this stage the plan is to increase the shoulder harness attachment > brackets > to 0.093 and using Larry's idea of a cross fuselage support at the > front/rear > baggage shelf junction and the zee channel all secured with A5 rivets. To > spread > the load I am using .040 L's from the centre of the cross fuselage harness > support (long name?) to the back corners of the rear baggage shelf. Thus > creating > a truss of the rear baggage shelf and spreading the load hopefully over the > whole area. > > Does that sound suitable to the more engineering minded of you? > [Question] > > -------- > 701 scratch builder > one day it will fly > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p 3905#203905 > > -- I'll keep looking for the haystack, 'cause when I look in Linda's eyes The thought there is a needle, makes it worth a thousand tries...


    Message 4


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    Time: 10:52:51 AM PST US
    From: "BokKat" <bobkat@btinet.net>
    Subject: Re: Zenith701801-List Digest: 8 Msgs - 09/11/08
    I wondered about that, too. But then wouldn't you need to put them on the underside of the slats, or on the wing's leading edge between the slats and the wing itself?? ----- Original Message ----- From: Bob & Lin To: zenith701801-list@matronics.com Sent: Friday, September 12, 2008 12:23 PM Subject: Zenith701801-List: Re: Zenith701801-List Digest: 8 Msgs - 09/11/08 Another Slat issue... Since the slats become effective at high angles of attack, and even Zenair is using Feathers VGs on the elevator, has anyone thought of using VGs on the front of the slats to add control at shallower angle of attack while keeping the slats benefit for steeper approaches? Anyone care to try that for the best of both worlds? Bob Lee On Fri, Sep 12, 2008 at 2:58 AM, Zenith701801-List Digest Server <zenith701801-list@matronics.com> wrote: * Online Versions of Today's List Digest Archive Today's complete Zenith701801-List Digest can also be found in either of the two Web Links listed below. The .html file includes the Digest formatted in HTML for viewing with a web browser and features Hyperlinked Indexes and Message Navigation. The .txt file includes the plain ASCII version of the Zenith701801-List Digest and can be viewed with a generic text editor such as Notepad or with a web browser. HTML Version: http://www.matronics.com/digest/digestview.php?Style=82701&View=html& Chapter 08-09-11&Archive=Zenith701801 Text Version: http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&C hapter 08-09-11&Archive=Zenith701801 ====================== EMail Version of Today's List Digest Archive ====================== ---------------------------------------------------------- Zenith701801-List Digest Archive --- Total Messages Posted Thu 09/11/08: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:22 AM - Re: Unequal fuel tank levels (Zed Smith) 2. 06:40 AM - Re: Unequal fuel tank levels (n85ae) 3. 08:16 AM - test (Dan) 4. 08:27 AM - Re: test (Ken Arnold) 5. 11:32 AM - CH701 POH (Ken Arnold) 6. 12:54 PM - Re: Shoulder Harness attachment (n85ae) 7. 02:46 PM - Re: CH701 POH (John Swanson) 8. 05:19 PM - Re: Shoulder Harness attachment (Viper_on_line) ________________________________ Message 1 _____________________________________ Time: 05:22:39 AM PST US From: Zed Smith <zsmith3rd@earthlink.net> Subject: Zenith701801-List: Re: Unequal fuel tank levels do not archive Gravity-induced air leakage is the problem. One wing, being slightly lower than the other, upsets the intended equal distribution of fuel. This then results in massive amounts of air getting into the higher tank. A two-inch left-to-right tilt is nearly one-half the depth of the 701 tanks; nearly one-half the capacity. A wise old ag pilot once told me that the prop was just a big fan....it is there to keep the pilot cool. He went on to say that if the fan stops you can see the pilot sweat. Those with unequal fuel levels may need to install an auxillary air pump to replenish the tank with less air. This may help to keep the fan running. Everybody have a nice day, and straighten up and fly right-hand patterns!! Zed ________________________________ Message 2 _____________________________________ Time: 06:40:59 AM PST US Subject: Zenith701801-List: Re: Unequal fuel tank levels From: "n85ae" <n85ae@yahoo.com> If you guys REALLY want to understand why the fuel level is different, then you have to drop the simplistic view. Go to Google and search on "fluid dynamics hydraulic head", it's not completely simple but this is the explanation as to why the difference. There are a great number of factors that are at play, the end result is pressure differential across the tanks Regards, Jeff Read this topic online here: http://forums.matronics.com/viewtopic.php?p 3794#203794 ________________________________ Message 3 _____________________________________ Time: 08:16:37 AM PST US From: Dan <dwilde@clearwire.net> Subject: Zenith701801-List: test test do not archive ________________________________ Message 4 _____________________________________ Time: 08:27:23 AM PST US From: "Ken Arnold" <arno7452@bellsouth.net> Subject: Re: Zenith701801-List: test good test Dan, do not archive ----- Original Message ----- From: "Dan" <dwilde@clearwire.net> Sent: Thursday, September 11, 2008 11:13 AM Subject: Zenith701801-List: test > > test > do not archive > > > > > ________________________________ Message 5 _____________________________________ Time: 11:32:34 AM PST US From: "Ken Arnold" <arno7452@bellsouth.net> Subject: Zenith701801-List: CH701 POH Hi Listers, I have a draft of the subject. Still needs some tweaks. Anyone wanting to take a look is welcome. Please contact me directly via my e-mail address. Regards, Ken do not archive ________________________________ Message 6 _____________________________________ Time: 12:54:34 PM PST US Subject: Zenith701801-List: Re: Shoulder Harness attachment From: "n85ae" <n85ae@yahoo.com> Something to think about, because Zenith sure did not do their engineering calculation with regard to the seatbelts. I calculated the stock 801 seat belt tabs at 200lb.s at 10G's in shear, if indeed the rivets don't pull out before that. So I replaced them with 4130 steel the same thickness which I bolted with AN3's to the fueslage longerons. I also added structure to the center console. Crash impacts can go up to 40/50G's and be survivable, so I'm not sure what they were thinking when the designed the stock ones. But they were not designed to handle more than the bare minimum. I suppose if I crash that hard I might not survive anyway, but I sure don't want to leave on account the seat belt tabs sheared. Jeff Read this topic online here: http://forums.matronics.com/viewtopic.php?p 3870#203870 ________________________________ Message 7 _____________________________________ Time: 02:46:12 PM PST US From: "John Swanson" <jswanson@jamadots.com> Subject: Re: Zenith701801-List: CH701 POH ----- Original Message ----- From: Ken Arnold To: zenith-list@matronics.com Sent: Thursday, September 11, 2008 2:30 PM Subject: Zenith701801-List: CH701 POH Hi Listers, I have a draft of the subject. Still needs some tweaks. Anyone wanting to take a look is welcome. Please contact me directly via my e-mail address. Regards, Ken do not archive KenI would like to see ur Poh I hope have my 701 flying this month.CH701 912 ULSJohn Swanson ------------------------------------------------------------------------- ----- Checked by AVG - http://www.avg.com 9/11/2008 7:03 AM ________________________________ Message 8 _____________________________________ Time: 05:19:57 PM PST US Subject: Zenith701801-List: Re: Shoulder Harness attachment From: "Viper_on_line" <randnc@bigpond.com> Thanks Guys, The load dissipation of the seat belt mount can become intricate when you can't get to a longeron as in the case of the shoulder harness. And then as has been said is the 0.063 going to be going to be strong enough to prevent the bolt ripping out if you make the mounting structure too strong? I think it is better to have the seatbelt support structure crumple but keep you at least partially secure than have the belt bolt rip out. At this stage the plan is to increase the shoulder harness attachment brackets to 0.093 and using Larry's idea of a cross fuselage support at the front/rear baggage shelf junction and the zee channel all secured with A5 rivets. To spread the load I am using .040 L's from the centre of the cross fuselage harness support (long name?) to the back corners of the rear baggage shelf. Thus creating a truss of the rear baggage shelf and spreading the load hopefully over the whole area. Does that sound suitable to the more engineering minded of you? [Question] -------- 701 scratch builder one day it will fly Read this topic online here: http://forums.matronics.com/viewtopic.php?p 3905#203905 -- I'll keep looking for the haystack, 'cause when I look in Linda's eyes The thought there is a needle, makes it worth a thousand tries...


    Message 5


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    Time: 12:25:09 PM PST US
    Subject: Re: 801 seat belts
    From: "n85ae" <n85ae@yahoo.com>
    I don't have pics, but I can describe what I did. The shoulder harness attach points I kept the originals, however I riveted them with Solid rivets. I made the assumption that the lap attach points would end up with the major load in a crash so I concentrated on them. REAR SEAT: The lapbelt attach points I replace with exact duplicates made from 4130 steel. On the rear seat belts I bolted them to the fues logerons with AN3 bolts (two bolts each side). The center attach point on the back side I made some 4130 angles which rivet to the sides of the tunnel that carries the elevator bellcrank, the center stock attach point then is bolted through the seat to the angles. So in effect you have the center attach riveted to the seat per Zenith plans, and then further bolted with two AN3 bolts to the 4130 angles which have as I recall 5 x 5/32 solid rivets conecting to the bellcrank tunnel sides. FRONT SEAT: The front seat center attach is 4130, and on the inside of the tunnel I used .063 6061 and made an aluminum backing plate with a 90 degree L at the front. The L at the front rivets through the 8F11-11 right above where the controls pass through. I replaced all the rivets with 5/32 solids The outboard seat attach points are 4130, also with .063 backing plates, the backing plates are also riveted through where the 8F11-11 attaches to the cabin sides. Could probably do more, but I guess at this point if what I added fails then likely it's not survivable anyways. Regards, Jeff Read this topic online here: http://forums.matronics.com/viewtopic.php?p 4005#204005


    Message 6


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    Time: 07:19:50 PM PST US
    From: Roy Szarafinski <rvickski@yahoo.com>
    Subject: 701 corvair
    The plan has finally come together , see video of the running engine on my 701 here http://www.youtube.com/watch?v=LzIyRPXRRR4 or at the end of my site at roysgarage.com It has been a long time in coming. Just have the wings to finnish up and a sport license to acquire. Plus a zillion loose ends. To all, keep building and be careful what you do 'temporarily' Roy


    Message 7


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    Time: 07:43:54 PM PST US
    From: Tracy <pbuttles@charter.net>
    Subject: 701 tunnel clearance
    has anyone had a problem with tunnel clearance in full left aileron and full down elevator? the pitch rod just touches the tunnel and has anyone done anything better than the bungee on the elevator cables ?




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